Riveting-hammer.



F. E. JOHNSONr RIVETING HAMMER.

APPLICATION FILED AuG.n.1sl5.

u I l NVENTOR WITNESSES ATTOR N EY Patented Aug. 27, 1918.

FRANCIS E. JOHNSON, 0F ALTOONA, PENNSYLVANIA.

RIVETING-HAMMER.

Specification of Letters Patent. Patented Aug. 2'7, 1918.

Application filed August 17, 1915. Serial No. 45,983.

To all whom it may concern:

Be it known, that I, FRANCIS E. JOHNSON, a citizen of the United States, residing at Altoona, in the county .of Blair and State of Pennsylvania, have invented certain new and useful Improvements in Riveti-ngprovision of a safety attachment which may e'easily removed for replacing the die.

With these and other objects in view the invention consists in the novel details 'of constructionand arrangement of parts which will be more clearly understood from the following description and drawings, in which,

Figure 1 is a fragmental side elevation.

Fig. 2 is a longitudinal sectional view through the barrel of the hammer and safety attachment. F Fig. 3-is a section on the line 33 of Fig. 4 is a section on the line 44 of Fig. 2, and

Fig. 5 shows a longitudinal sectional view, through the barrel of the hammer, of a slightly modified form of the invention.

In the drawings, the .numeral 1 indicates the barrel of the hammer having a circumferential groove 2 formed near the outer end thereof and the purpose of which will be presently described. A rivet set or die, is indicated at 3, and-has the plunger rod it formed integral therewith and adapt ed to extend into the barrel 1, as is clearly shown in Fig. 2 of the drawings? A circumferential flange 5 is formed around the plunger 4 and is adapted to engage the end of the barrel 1, as is clearly shown in the drawings. A tortuous groove 6 is formed longitudinally of the plunger 4 and ex tends from the inner end'thereof to a point spaced from the flange 5, as is clearly shown in Fig. 2 of the drawings.

My safety attachment comprises" a metal lic collar 7 formed in two sections hingedly connected together, as indicated at 8, and

one of the sections is provided with a pin 9 adapted to be received within a perforation formed in a plate 10 connected to the opposite section. When the pin 9 is engagedin the perforation of the plate 10 the sections are held in closed relation. 'Each section of the collar is provided with a plurality of circumfere..tially spaced openings 11, the purpose of which will be presently described, and on the inner end of the collarv is formed a flange 12 adapted to engage in the groove 2 formed in the end of the barrel. The opposite end of the collar is provided with a flange 13 adapted to encircle and engage the shank of the die head t as is clearly shown in Fig. 20f the draw- '1ngs.

In Fig. 5 of the drawings I have shown.

a slightly modified form of my invention in which the hammer barrel is indicated at 14, the rivet set or die at 15, and the plunger formedon the die, is indicated at 16. A

flange 17 is formed around the plunger 16 and the-barrel 14 is provided with a circumferential groove 18 near the end thereof. The parts so far described are the same as that illustrated in the preferred form of the invention. A longitudinal groove 19 is formed in the plunger 16 and extends from the end thereof to a point spaced from the flange 17. -It will be seen that the modified form of the inventionis the same as the'preferred form with the exception that a straight groove 19 is formed in theplunger instead of a tortuous groove, as indicated at 6, in the preferred formof the invention.

Having fully described the detailed construction of my device it is thought that the advantages and operation will be readil understood and appreciated. It is a we 1 known fact that while riveting the rivet set,

' or-die will often slip from the rivet and be blown from the barrel of the hammer; .Such accidents often occur injuring and endangering the lives of the operators. It isto overcome the blowing of the die from the hammer that my invention is designed.

When the rivet set or die 3 is placed upon the rivet it will be operated in the usual manner'but should the die. slip from the rivet the plunger will be forced out by the air presure until the groove therein extends beyond the end of the barrel. The air will then escape through the groove and out through the perforations in the collar 7 and the die will therefore be prevented from being blown from the barrel. The flange formed on the plunger engaging the flange 13 on the collar 7 will act as a further safety device or 'stop for limiting the movement of the (lie. When it is desired to remove the die for replacing or any Other purpose it is only necessary to remove the collar and this canbe done by removing the pin 9 from the perforations in the platelO and swinging the sections on the hinge 8.

Having fully described the invention what I claim as new and desire to secure by Letters Patent is 1. In a riveting hammer, a barrel, and a die having a plunger operating in said bar- I rel, said plunger being provided with a collar and equipped on its outer surface with a longitudinally extending groove, open at the innerend, and means connected to the collar to limit the movement of said plunger. a

2. In a riveting hammer, a barrel, a die having a plunger operating in said barrel, said plunger being provided on its outer surface with a. longitudinally extending groove open at the inner end thereof, and a perforated collar carried by said barrel and limiting the movement of said plunger, the perforations in said collar adapted at times for communication, with the groove in said plunger as and for the purpose specified.

3. In a riveting hammer, a barrel, a die having a plunger operating in said barrel,

a flange formed on said plunger, and a collar comprising hingedly connected sections adapted to clamp around the barrel, for engaging the flange on said plunger, and looking means for retaining said collar in place. 4. In a riveting hammer, a barrel, a die having a plunger operating in said barrel, a flange formed on said plunger, a collar comprising connected sections adapted to clamp around the barrel, and fastening means carried by one section of the collar, and adapted to engage the other section.

5. In a riveting hammer, a barrel, a die having a plunger operating in said barrel, :1 flange formed on said plunger, said plunger rovided on its outer surface with a longitudinally extending groove, having the inner end thereof open and the opposite end provided with perforations adapted to communicate with the groove in said plunger when the latter has been forced outwardly as and for the purpose specified.

6. In a riveting hammer, a barrel and a die having a plunger slidably mounted in said barrel, said plunger provided with a tortuous groove, open at its inner end and extending longitudinally along the outer surface of said plunger, said groove adapted at times to permit escape of the air in said barrel.

7. In a riveting hammer, a barrel, and a die havinga plunger slidably mounted in said barrel, said plunger provided with a passageway normally sealed by said barrel but adapted to be unsealed by the longitudinal movement of said plunger to permit escape of the air within said barrel.

8. In a riveting hammer, a barrel, and a die having a plunger slidably mounted in said barrel, said plunger provided with a longitudinally extending passageway open at its inner end, and normally sealed by the walls of said barrel, but adapted to be unsealed by the longitudinal movement of said plunger to permit escape of the pressure within said barrel.

9.- A pneumatic riveting hammer comprising a barrel, a die equipped with a plunger slidably mounted in said barrel, means connecting said plunger and barrel and permitting limited outward movement of the latter, and an escape passage-way controlled by the movement of said plunger to permit escape of the pressure within said barrel, said passage-way being arranged in such a manner as to place the interior of the barrel in commumcation with the atmosphere upon a predetermined outward movement of said plunger.

In testimony whereof I afiix my signature in presencemf two witnesses.

FRANCIS E. JOHNSON.

Witnesses: I

'THos. F. DILLON,

THOMAS T. BLAIR. 

